抄録
A surgical operation is useful for the medical treatment of a brain tumor. The displacement of the tumor position due to change of the inner brain pressure from the position detected by MRI measurement is a great problem for the operation. It is almost impossible to detect the tumor visually due to the same color of the tumor tissue and the normal tissue. Sensing of magnetic field generated from the fine magnetic particles with a monoclonal antibody accumulated in the tumor tissue would be an effective way to detect the position of the tumor in the operation. A highly sensitive and potable micro magnetic sensor such as MI sensors having a resolution of 10-5 Oe for DC field are required to detect such a very weak and localized field. Spatial distributions of a stray field of gel samples, in which fine magnetic particles are dispersed, were measured using the amorphous wire MI sensor aiming the brain tumor positioning. The spatial distributions were analyzed by an aligned dipole moment model. The calculation results using the model were good agreement with experimental results.
